Formation and Transportation of Disperesed Phases in Microchannels and Development of Microseparators for Heterogeneous Systems.
Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants|
Properties in chemical engineering process/Transfer operation/Unit operation
|Research Institution||Fukuoka University|
MOROOKA Shigeharu Fukuoka University, Faculty of Engineering, Professor, 工学部, 教授 (60011079)
KARIYASAKI Akira Fukuoka University, Faculty of Engineering, Professor, 工学部, 教授 (10078652)
KUSAKABE Katsuki Fukuoka Women's Univ., Dept.of Environmental Science, Professor, 人間環境学部, 教授 (30153274)
MAEDA Hideaki AIST Micro-space Chemistry Lab., Laboratory Head, マイクロ空間化学研究ラボ, ラボ長 (60238871)
YAMASAKI Yoshikazu Fukuoka University, Faculty of Engineering, Assistant, 工学部, 助手 (20122757)
|Project Period (FY)
2003 – 2004
Completed(Fiscal Year 2004)
|Budget Amount *help
¥10,700,000 (Direct Cost : ¥10,700,000)
Fiscal Year 2004 : ¥4,600,000 (Direct Cost : ¥4,600,000)
Fiscal Year 2003 : ¥6,100,000 (Direct Cost : ¥6,100,000)
|Keywords||Microchannel / Multiphase Flow / Mass Transfer / Chemical Reaction / Simulation|
Separation processes possess major parts in all chemical plants, and, therefore, effective miniaturization of separation units actually decides the success of micro-chemical plants. Multi-phase flows are especially important because they are utilized in principal separation units, such as distillation, gas absorption, extraction and particle separation. In the present study, microchannels with a variety of configurations are fabricated, and multi-phase flows for gas-liquid and liquid-liquid systems are investigated by experiments and computational fluid dynamics.
The effects of vibration on gas-liquid microchannel flow were investigated in detail. The vibration along the flow direction accelerated coalescence of fine bubbles, while the vibration perpendicular to the flow direction caused self-exited vibration. These findings are important to control the behavior of fine bubbles in microchannels.
Measuring techniques of gas-liquid flow in microchannels were developed, and pressure drop an
d relative velocity of fine bubbles were fully determined.
Flow patterns in horizontal microchannels for liquid-liquid systems were determined as functions of physical properties of liquid, inlet shapes, and liquid flow rates. The criteria for homogeneous droplet flow, heterogeneous droplet flow and layered two phase flow were respectively evaluated.
Two-phase flows in microchannels were simulated by using computational fluid dynamics software (FLUENT). The results were in good agreement with the experimental data. The affinity between the wall surface and the flowing fluid was found to play a key role for the formation of homogeneous fine droplets.
The liquid-liquid flow systems were also studied with respect to extraction, and the conditions for stable liquid-liquid separation at the exit were obtained. The extraction of Cu ions was then carried out, and it was found that the design of the microchannel strongly influenced the extraction efficiency. The backmix properties of microchannel flow were also investigated.
The above results evidently contribute the creation of noble separation units for multi-phase systems in the scale of microchannels. Less
Research Products (19results)